1: (+)-camphor-10-sulfonic acid / octane / 3 h / Heating 2: pyridine / 0.5 h / 20 °C View Scheme

1: (+)-camphor-10-sulfonic acid / octane / 3 h / Heating 2: pyridine / 0.5 h / 20 °C View Scheme

1: 3,7-Dimethyl-1.6-octadien-3-ol; 2,3,5-trimethyl hydroquinone With camphor-10-sulfonic acid in anhydrous xylene 5 h; Inert atmosphereReflux; 2: acetic anhydride With pyridine T=20°C; Inert atmosphereCooling with ice;

in pyridine T=20°C; 0.5 h;

1: 3,7-Dimethyl-1.6-octadien-3-ol; 2,3,5-trimethyl hydroquinone With camphor-10-sulfonic acid in N-dodecane; dichloromethane Inert atmosphereReflux; 2: With pyridine; acetic anhydride T=20°C; Inert atmosphereCooling with ice; 3: citronellylmagnesium chloride; acetic anhydride Further stages;